Upload error on localhost (at minimum, not yet tested online)

uploading a picture on localhost I keep receiving following error:

Post-processing of the image failed likely because the server is busy
or does not have enough resources. stopping any upload, even the file
is relatively small, few kb, 1290×720, or max 1980×1020 or similar.

tried the way to modify app/theme/theme_name/app/setup.php by adding

add_filter( ‘wp_image_editors’, function() { return array( ‘WP_Image_Editor_GD’ ); } );

with no success.
still having same issue.

created a plugin with:

add_filter( 'big_image_size_threshold', '__return_false' );

but still nothing (MEDIA settings are capped to 9999 per each dimension)

any basic config am I missing?

ty and best! :smiley:

EDIT: PS: no way with the “official” plugin as well… https://wpackagist.org/search?q=BIG+Image&type=any&search=